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Finding the Fourth Proportional to 1,669.26, 2,503.86 and 681.86

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Solution

The fourth proportional to 1,669.26, 2,503.86 and 681.86 is: 1,022.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,669.26 : 2,503.86 = 681.86 : x
  2. Step 2: Convert to fraction form
    1,669.26/2,503.86 = 681.86/x
  3. Step 3: Cross multiply
    1,669.26x = 2,503.86 × 681.86
  4. Step 4: Simplify right side
    1,669.26x = 1,707,281.41
  5. Step 5: Solve for x
    x = 1,707,281.41/1,669.26
  6. Step 6: Final answer
    x = 1,022.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.